When the SlingPlayer iPhone app launched last May, it was hamstrung by AT&T's insistence that it stream video only over Wi-Fi. It was an untenable position, given that MLB.com and others already stream over 3G. Today, finally, the carrier relented.

We all know that tens of thousands of iPhones streaming TV 3G from their Slingboxes would slow down …
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This has been in the works since mid-December, and both companies still need Apple's sign-off before the new 3G SlingPlayer app is available. And don't worry: if you'd previously purchased the $30 Wi-Fi only app, you'll get a free upgrade once the new version is available.